LECANOCRINIDAE 169 



BB and RR about of equal height ; B to R to I Br, about 3:3:2. IBr 2, low and 

 wide; IIBr 3 to 4, exceptionally less. Column composed near calyx of very thin 

 columnals, slightly alternating for a considerable distance, when they become 

 longer, more uniform, and rounded; they are marked by longitudinal wrinkles 

 and strongly crenulated sutures. 



The two specimens on which this species is described are not in the best condition for 

 giving the contours of the calyx and crown, being much flattened, but they are sufficient for 

 clear definition as to all essentials. They have an identical history in one respect ; that of 

 figure 7 has been in my collection for several years, having been obtained among some other 

 Dudley material from an English collection, labeled Taxocrlmts tuberculatus ; that of figure 

 6 was observed by me, when studying the Flexibilia in the British Museum, among a number 

 of specimens of T. tuberculatus; it did not seem to fit in that company, and I obtained a cast 

 of it for comparison with my own specimen, which had been decorated with a " ? ". The two 

 lay together unplaced until my specimens from Tennessee came to light, when it was at once 

 apparent where they belonged. This form is evidently very rare at Dudley, as I know of no 

 other specimens. The relatively greater size of the IBr, smaller iBr, more elongate crown, 

 and surface ornament, readily distinguish this from the type species. 



Types. The original of figure 6 is in the British Museum ; of figure 7 in the author's 

 collection. 



Horizon and locality. Silurian, Wenlock Group ; Dudley, England. 



Hormocrinus gotlandicus n. sp. 



Plate XIV, figs. 8a-d 



Specimen about the same size as those of the last species ; crown more elon- 

 gate. Calyx low, broadly spreading, without sharp angular ridges or surface 

 markings. Height to width at top of RR, 1 to 2 ; spread of calyx to same level, 

 1 to 4; cross-section at IBr strongly pentagonal. Crown at second bifurcation, 

 about 20 mm. high; width at IAx, about 16 mm. 



IBB short, not projecting or forming a rim. BB large. Anal and first 

 iBr plates very wide, truncate for their entire width and directly succeeded by 

 perisome, without other plates at the wings. RR relatively low, about as high as 

 BB. IBr half the height of RR, strongly convex and relatively narrower than 

 in other species; variable in number from 3 to 5 in same specimen. IIBr 2 to 3, 

 widely diverging on axillary IBr, which has a truncate apex; this feature ex- 

 tends to the higher divisions which are, so far as seen, strongly divergent. 

 Arms round, without angularity in any part of the ray. Column strong, com- 

 posed near the calyx of very short columnals of about even diameter, slightly 

 alternating in length. 



The species is founded upon a single specimen from Gotland, which is well preserved. 

 The irregularity in number of brachials and the widely divergent arm-branches give it a 

 peculiar aspect, which with the absence of sharp angular ridges readily distinguishes the 

 species. 



Type. Riks Museum, Stockholm. 



Horizon and locality. Silurian, Wenlock Group ; Alskog, Island of Gotland. 



